Witn esses



(No Model.)

No. 6I6,887.

J. P. BROPHY.

LATHE ATTACHMENT FOR CUTTING IRREGULAR FORMS.

(Application filedMar. 14, 1898.)

Patented Jan. 3, I899.

2 Sheets-Sheet l.

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No. 6|6,887. Patented Jan. 3, I899. J. P. BROPHY.

LATHE ATTAGHMENT'FOR CUTTING IRREGULAR FORMS.

(Application filed. Mar. 14, 1898.)

2 Sheets-Sheet 2.

(No Model.)

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NITED STATES PATENT FFICE.

JOHN I. BROPHY, OF CLEVELAND, OHIO, ASSIGNOR TO THE CLEVELAND MACHINE SCREW COMPANY, OF SAME PLACE.

LATHE ATTACHMENT FOR CUTTING IRREGULAR FORMS.

I SPECIFICATION forming part of Letters Patent No. 616,887, dated January 3, 1899.

Application filed March 14; 1398- serifll NO- 673,681. (No model.)

To aZZ whom it may omwern:

Be it known that 1, JOHN P. BROPH Y, a citizen of the United States, and a resident of Cleveland, county of Cuyahoga, and State of Ohio, have invented a new and useful Improvement in Attachments for Cutting Irregular Forms, of which the following is a specification, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle so as to distinguish it from other inventions.

My invention relates to an-attachment for lathes and screw-machines, particularly automatic screw-machines, by means of which I am enabled 011 any machine of the character noted to make taper pins and other irregular forms.

The annexed drawings and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawings, Figure I is a front view showing my attachment secured in the chuck-head of ascrew-machine. Fig. II is a plan view of the same. Fig. III is a transverse section taken on the line 3 3 of Fig. II and in the direction indicated by the arrow. Fig. IV is a plan of a former. Fig. V is a plan view of a former of different form.

My attachment consists of a box-mill A, of oblong form, having the spindle a integral therewith and cut away in its central portion b. Astock-opening cis provided in one of the cut-away portions, through which the stock d may pass in operation. A tool-opening 6 is formed transversely through the boxmill, and in said opening a cutter f is secured. A slot g is formed in the box-mill, and in said slot a slide g is located, set-screw g securing said tool f in said slide. A pin h is secured in the lower part of said slide and extends downwardly therefrom. The rear extension of the tool fis provided with an annular head f and a spring 1 is located intermediate of said head and the box-mill. The former J is secured to the cross-slide J of the machine-frame by suitable means, is provided with the rearwardly-extending portion j, and is held in adjustable position by means of set-screwsj. The edge 9' of said former is practically a counterpart of one edge of. the article to be formed.

The operation is as follows: is secured in themachine by means of spindle a. One side of the machine and the former is properly secured to the cross-slide. The stock to be operated upon is secured in the chuck-head and passes through the opening 0- of the box-mill, rotating against the cuttingtool f. The operation of the machine advances the box-mill toward the chuck-head holding the stock to be operated upon. The depending pin h, having bearing against the edge 3' of the former J, causes the cutting edge of the cutting-tool in its forward movement to move on a line parallel with and in conformation to the outline of the edge 3' of the former.

By means of the set-screw g the cuttingtool may be adjusted forwardly or rearwardly, as desired. The opening 0 in the box-mill acts as a guide-rest for the stock to be operated on, preventing springing of the stock. Spring f" exerts rearward pressure on the cutting-tool and tends to keep pin h in engagement with the edge of the former, the slide g having easy movement in the slot g. It will be seen that by means of this attachment any irregular form can be cut out on a lathe or screw-machine, Whetherautomatic or otherwise, by merely securing the attachment in proper position and providing it with a former of proper contour for the work to be made.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means covered by any one of the following claims be employed.

I therefore particularly point out and dis* tinctly claim as my invention- 1. In an attachment for cutting taper pins and articles of irregular form, the combination of a box-mill provided with a recess, a tool-holder located in said recess and having sliding movement therein, said tool-holder having a depending lug adjustable longitudi- The box-millnally of said tool, and a former substantially iucounterpart of the article to be operated upon, substantially as set forth. 2. In an attachment for cutting taper pins and articles of irregular form, the combination of a box-mill havinga tool-opening and provided with a recess, a tool-holder located in said recess and having sliding movement therein, said tool-holder having a depending lug adjustable longitudinally of said tool and a former substantially in counterpart of the article to be operated upon, substantially as set forth.

In an attachment for cutting taper pins and articles of irregular for1n,the combination of a box-mill provided with a stock-opening,

a tool-openin g and a tool-holder opening, said stock-opening and tool-opening located in juxtaposition and substantially at right angles to each other, a tool-holder located in said tool-holder opening and through which said tool passes, said tool-holder adjustable longitudinally of said tool and provided with a depending lug, a former adjustable relatively to the article to be operated upon and engaging With said tool-holder lug, substantially as set forth.

Signed by me this 11th day of March, 1898.

JOHN P. BROPHY. Attest:

D. '1. DAVIES, A. E. MERKEL. 

